Date: Sun, 2 Aug 2020 11:18:25 -0700
Reply-To: David McNeely <davmcneely40@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David McNeely <davmcneely40@GMAIL.COM>
Subject: Re: Fuel hose size
In-Reply-To: <CY4PR0801MB3731A90865EC96D1959982A0A04C0@CY4PR0801MB3731.namprd08.prod.outlook.com>
Content-Type: text/plain; charset="UTF-8"
Dennis, you are onto something, but another group I respect greatly seems
not to have considered the static concern to be a problem, or else has
simply not considered it. GoWesty sells a grommet specifically for the
purpose of running a hose through the hole in the "firewall." My 1991
Volkswagen Vanagon GL Campmobile has been so equipped since 2008.
Speaking of 2008, that is when I replaced all the fuel hoses. I have asked
before on this list if it is time to do so again, but no one has responded
to the question. Is it time?
Thanks, mcneely
On Sun, Aug 2, 2020 at 7:53 AM Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> I am not sure that this is a good approach. When looking at fuel hoses we
> look at pressure and temperature ratings and we pay attention to the outer
> jacket and how it will interface with clamps. What I never see mentioned is
> conductivity or the ability to dissipate static charges nor the ability to
> resist electrolysis. That is what really causes hoses to crack and fail on
> the inside.
>
> Whenever a fluid flows through a tube or hose static charges are
> generated. Even when you fill a plastic gas can, the can is static
> dissipative and hence the signs at the filling station advising the
> container shall be placed on the ground and the nozzle in contact with the
> container while filling. That plastic tube is a life time part. Hoses are
> not although the original have lasted 10 -15 years or even more. With VW
> being cost conscious as they are there is no part or design that doesn't
> serve some purpose. My thoughts are that the hose sections are kept short
> for a reason and it could even be that that firewall nipple is a
> strategically place insulator, in addition to a service feature for engine
> removal. The longer a hose the higher the static potential can be. I
> really don't know, just a thought and all modifications needs thought. I
> just give the VW engineers credit for knowing a lot more than me.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of
> Richard Koerner
> Sent: Saturday, August 1, 2020 7:37 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Fuel hose size
>
> Superb! Well thought out.
>
> On Saturday, August 1, 2020, 3:46:04 PM PDT, OlRivrRat <
> olrivrrat@comcast.net> wrote:
>
> IMHO,, The Correct Way To Do the Fuel Supply Hose Replacement
>
> & The Way that I Always Recommend that It Be Done is to Run 1 Single
>
> Length of High Pressure Fuel Injection Hose frm Fuel Filter to the Splitter
>
> "T" by the OilBreather Tower ~ You end up with Only 2 Possible Leak Points
>
> Instead of 6 & a Brand New, Really Strong, All 1 ID Hose ~
>
> (I use 225PSI Gates 5/16) It is Pricey Hose @ about $3.50/Ft but only takes
>
> about 6.5Ft >> Way Cheaper than an Engine Fire ~
>
> Also >> I usually DoNot run the Hose back through the hole left by
> the
>
> removal of the Old Plastic PasThru Fitting, I just run it under the
> FireWall &
>
> then it aligns nicely with passing under the Intake ~
>
> ORR ~ DeanB
>
>
> On 31 Jul , 2020, at 7:03 PM, Rob wrote:
>
> > 7.5mm, thank you. The last time I did this the plastic tube was a good
> > fit inside the hose, I ran it in 6" or so & used two clamps with no
> > leaks. I was planning on doing this again.
> >
> > Rob
> > vwrobb@gmail.com
> >
> >
> > On Fri, Jul 31, 2020 at 3:30 PM Dennis Haynes
> > <d23haynes57@hotmail.com>
> > wrote:
> >
> >> At some point VW went to a 7.5mm ID hose in part to reduce reliance
> >> on the clamps. For the firewall fitting it gets a bad rap. A more
> >> common place to leak is where the hose attaches to the plastic tube
> >> from the filter. Hose selection and clamp choice and installation is
> >> extremely critical. Too lose and the hose slides off or leaks, too
> >> tight and the plastic tube collapses especially after some heat. On
> >> other vehicles that use this type of tube a sleeve goes inside to
> support the tube from collapsing.
> >>
> >> Spring or crimp clamps are the best choice here.
> >>
> >> It is worth noting the OEM the hoses on the engine and outside the
> >> compartment are different part numbers-construction. With the
> >> aftermarket stuff we go from 10-15 year hoses to 2-5!
> >>
> >> Dennis
> >>
> >>
> >> -----Original Message-----
> >> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of
> >> Rob
> >> Sent: Friday, July 31, 2020 4:59 PM
> >> To: vanagon@GERRY.VANAGON.COM
> >> Subject: Fuel hose size
> >>
> >> What size fuel hose do I need to replace the one from the firewall
> >> plastic fitting to the engine?
> >>
> >> Rob
> >> vwrobb@gmail.com
> >>
>
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